1,004
edits
Changes
Jump to navigation
Jump to search
Line 17:
Line 17: − [[Image:AmpBoard_FETorient.png|frame|Quick fix for the package-footprint mismatch of the FET swtich]] Line 31:
Line 30: + Line 36:
Line 36: + + + + + + + + + + + + +
Amplifier board debugging notes (view source)
Revision as of 16:26, 31 March 2010
, 16:26, 31 March 2010no edit summary
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==
=== Description ===
=== Description ===
== FET switch compatibility ==
== FET switch compatibility ==
[[Image:AmpBoard_FETorient.png|frame|Quick fix for the package-footprint mismatch of the FET swtich]]
=== Description ===
=== Description ===
The FET switch BF1108 was not available in our market. Only its mirror package variant BF1108R could be procured.
The FET switch BF1108 was not available in our market. Only its mirror package variant BF1108R could be procured.
=== Solution ===
=== Solution ===
* ''Temporary solution'': The adaptation of the board for the BF1108R is shown in the adjacent figure. The IC is positioned in the shown orientation and its pins (pads) linked as shown.
* ''Temporary solution'': The adaptation of the board for the BF1108R is shown in the adjacent figure. The IC is positioned in the shown orientation and its pins (pads) linked as shown.
* '''modifications of the PCB layout is pending'''
== LEMO receptacle does not fit through holes ==
=== Description ===
The through whole LEMO receptacle does not fit its designated holes.
=== Cause ===
The pin spacing looks correct, but there does not appear to be sufficient slack in the hole: both pin and hole are specified to be 30mil diameter. Additionally, for the hole size - that specification may only refer to the drill size, not the after-plating diameter.
=== Solution ===
* The purchases LEMO receptacle pins were filed to fit the holes of the prototype board.
* '''modifications of the PCB layout is pending'''
* '''modifications of the PCB layout is pending'''